CVE-2026-43127

ntfs3: fix circular locking dependency in run_unpack_ex

State: Published
Severity: Not scored
Published: May 6, 2026
Updated: Oct 21, 2026
Reserved: May 1, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

ntfs3: fix circular locking dependency in run_unpack_ex

Syzbot reported a circular locking dependency between wnd->rw_lock (sbi->used.bitmap) and ni->file.run_lock.

The deadlock scenario: 1. ntfs_extend_mft() takes ni->file.run_lock then wnd->rw_lock. 2. run_unpack_ex() takes wnd->rw_lock then tries to acquire ni->file.run_lock inside ntfs_refresh_zone().

This creates an AB-BA deadlock.

Fix this by using down_read_trylock() instead of down_read() when acquiring run_lock in run_unpack_ex(). If the lock is contended, skip ntfs_refresh_zone() - the MFT zone will be refreshed on the next MFT operation. This breaks the circular dependency since we never block waiting for run_lock while holding wnd->rw_lock.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	57f7979aefdcef66326bda47e07ee0d8be64bf21 to before d60f09d2d16c44a797d8cb67015cde2508720506Affected db7fc56646cafe39599a4c21f1398e2bdfd5c185 to before 76016d15bbd90caa0ce7765fddf9bde8e943e601Affected 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before b014372b62237521444ee51384549bdf48b79015Affected 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before b8d22d9d8260b0f4f4d8e2898c98037c9982ea66Affected 5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03Affected 6.6.66 to before 6.6.160Affected 6.12.5 to before 6.12.114Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.16 through 6.18.Not affected 6.19.6 through 6.19.Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

57f7979aefdcef66326bda47e07ee0d8be64bf21 to before d60f09d2d16c44a797d8cb67015cde2508720506Affected
db7fc56646cafe39599a4c21f1398e2bdfd5c185 to before 76016d15bbd90caa0ce7765fddf9bde8e943e601Affected
5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before b014372b62237521444ee51384549bdf48b79015Affected
5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before b8d22d9d8260b0f4f4d8e2898c98037c9982ea66Affected
5fc982fe7eca9d0cf7b25832450ebd4f7c8e1c36 to before 08ce2fee1b869ecbfbd94e0eb2630e52203a2e03Affected
6.6.66 to before 6.6.160Affected
6.12.5 to before 6.12.114Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.16 through 6.18.*Not affected
6.19.6 through 6.19.*Not affected
7.0 and laterNot affected

References

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